Enable pca953x driver to support OS LED function. ( preview version).

NOTE :

NuttShell (NSH)
nsh> pca953x info
---------------------------
PCA9533
---------------------------
INPUT               0x0B
PSC0                0xFE
PWM0                0x05
PSC1                0x0E
PWM1                0x80
LS0                 0x10
---------------------------
PCA9536
---------------------------
INPUT               0x00
OUTPUT              0x00
POLARITY            0x00
CONFIG              0x00
---------------------------
nsh>

Signed-off-by: cctsao1008 <chiacheng.tsao@gmail.com>